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- Purification of benzoic acid 1. What is the purpose of washing the crystal in the filter paper with water? 2. How recrystallization affects the theoretical yield of sample? Explain.A 0.100 gram sample of phthalic acid was dissolved in 100 mL of water. When 25 of diethyl ether was used to extract the phthalic acid, 0.042 grams of phthalic acid re recovered. What is the distribution coefficient for this extraction Kp?Let's assume that 5.6 g of crude product was isolated, and 4.19 g of pure product was collected after recrystilization 8. Let's assume that the melting point of the recrystallized product was 104-108°C. What conclusions can you draw? Provide a brief discussion of these results.
- 1. Which of the following may cause an increase in the calculated percent recovery of the recrystallized benzoic acid? a.Adding too much solvent in the receiving flask during hot filtrationb.Using cold water in rinsing the residue from the flask during hot filtration c.Using fluted filter paper during hot filtrationd.Not adding animal charcoal to the solution2. Which set of reagents can confirm that sulfate ions are present in two unkown solutions? a.1.0 M NaOH and excess NH3 b.0.1 M Ba(NO3)2 and 0.01 M KMnO4 c.1.0 M NaOH and 0.1 M K2Zn3[Fe(CN)6]2d.0.1 M Ba(NO3)2 and 1.0 M CH3COOHAfter a crude product is dissolved in 1.5 mL of hot solvent, the resulting solution is dark brown. Because the pure compound is reported in the literature to be colorless, it is necessary to perform a decolorizing procedure. Should you use pelletized Norit or powdered activated charcoal to decolorize the solution? Explain your answer.a. Assume a certain extraction has a distribution co-effecient of 7.5. The combination is made up of a certain quantity of caffeine dissolved in 100 ml of water. b. Re-crystallization was used to purify a 25 g organic compound. The amount recovered upon re-crystallization was 8 g. (Write the balancing equations for C,H, and O.:)
- need this answer in detail. don't copy elsewhere I will downvote . A separation of the mixture of substances X and Y is carried out by extraction of Craig using an organic solvent of the same volume. What is the dissolved Y fraction in the 18th tube after 24 times of removal if Dy = 5 is knownRECRYSTALLIZATION & DECOLORIZATION (Organic Chemistry) 1. Propose a process or procedure by which the purity of re-crystallized benzoic acid can be proven. 2. If you are to account for the three components of the original mixture, considering that they were separated, in what form or state, and where were they after the whole process?Outline a method from Chronology, recrystalation and liquid to liquid extraction for how you would separate a solution of the three molecules above in ethyl acetate. Explain your rationale with finding the pKa level
- A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the purified benzoic acid off the filter paper after it had dried and took the melting point as a test for purity. He was surprised that most of the white solid melted sharply between 121 and 122 0C but that a small amount remained unmelted even at temperatures above 200 0C. Explain this behavior.Explain why aqueous permanganate must be freshly standardised before use in the experiment Determination of sodium percarbonate in a commercial detergent .Suppose a particular extraction proceeds with a distribution coefficient of 7.5 The mature consists of a certain amount of caffeine dissolved in 100 mL of water. a .How much caffone was originally used when 0.31 g of the organic compound was dissolved in water and 150 = L ether was used as extraction solvent b. How much was dissolved in ether?